Remote control indicator system



Jan. 2, 1934. K. WILDE REMOTE CONTROL INDICATOR SYSTEM 2 Sheets-Sheet 1 Original F led OCt- 1927 b'zglrFreyueh c9 T'anemiffer Jrzzzerzzar: Z101- h ilaie Jan.2, 1934. WILDE Re. 19,039

REMOTE CONTROL INDICATOR SYSTEM I ori inal Filed Oct. 22. 1927 2 Sheets- Sheet 2 3 H W mg 719/1 -Frquen c y k Fee eiuer- -7rzvenbr: f 3 Kart h zi'l l 0 X .2

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Reissued Jan. 2, 1934 OFFICE REMOTE CONTROL INDICATOR SYSTEM Kurt Wilde, Berlin-Wilmersdori, Germany, assignor, bymesne assignments, to Builders Iron Foundry, Providence, R. L, a corporation of.

Rhode Island Original No. Serial No.

1,822,683, September 8, 1931, 227,933, October 22, 1927, and in Germany October 23, 1926. Application for reissue September I, 1933. Serial No. 688,531

7 Claims. (Cl. 177 -351) This invention relates to that type of systems ior transmitting theindications of a measuring instrument to a distance (see for instance Rouckas U. S. Letters Patent'No. 1,597,828 of August 31, 1926) in which the receiver is operated periodically in accordance with the position of the pointer of the measuring instrument serving as a transmitter, and in which the transmitter is provided with a tester for this purpose and for each transmission of 'a pointer position or the like, effects two contacts, one of them when the said tester reaches a predetermined posit-i01 and the other when the tester reaches the pointer or equivalent member. I r

If these contacts are effected'in such a man ner as to close the circuit of the transmission line but momentarily, and if the first current impulse is employed for starting that member of the receiver which is to be shifted, while the second current impulse is employed to stop such member, there is danger of additional current impulses arising in the transmission line between said two impulses, for instance owing to disturbances in the line, induction effects, etc., and these additional current impulses will cause the receiver to give wrong indications. I

In order to guard against this drawback, I operate the receiver by means of currents caused to flow through the transmission line during a length of time corresponding to the time interval between the making of the above-mentioned two contacts, the first contact starting the flow of current and the second stopping such flow.

With this arrangement I secure the advantage that no disturbing eflects will result at the receiver in the event that extraneous currents. should, by induction, produce fluctuations in the strength of the current flowing throughthe transmission line. Furthermore, there will be no need of maintaining synchronism of transmitter and receiver permanently, but it will sufllce to maintain such synchronism during the time that current is flowing through the transmission line. Such temporary synchronism may be obtained by relatively simple driving motors, for

instance of tlie type having only a mechanical speed governor; such motors therefore would not require any electric interaction.

In the accompanying drawings, Fig. 1 is 9. diagrammatic view, with parts in section, illustrating, as an example, a transmitter for carrying out my'invention, and Fig. 2 is a diagrammatic view of a receiver'suitable for the purposes of my invention. y.- Fig. 3 is an elevation, with parts in section,

showing the pointer Z of Fig.1 and a brake or arresting mechanism cO-operating therewith; and Fig. 4 is a detail perspective view of certain parts that co-operate with the pointer S of Fig. 2. In Figure-1 Ais a measuring instrument, for

instance a wattmeter showing kilowatts, having a pointer Z moving freely over a scale. At the beginning or left hand of the scale is a fixed contact a in position to be wiped by a tester F which is rotated about the point J by an electric motor M01. 0n the end of the tester is a brush or other sliding contact member which touches the pointer as the tester goes around. The tester is connected to one pole of battery Bl, the stationary contact a and the pointer Z to the relays R1 and R2 respectively. When' the tester F, rotating in the direction of the arrow, touches contact a relay R1 is excited. At contact 2 it completes a holding circuit for itseli over back contact 5 of relay R2. At contact 3 it puts in cir-'- cuit the energizing coil of a brake'which arrests the pointer Z until the tester F reaches it. When this happens relay R2 is momentarily excited over tester F and pointer Z. The relay interrupts the holding circuit of relay R1 at contact 5 with the result that said brake is put out of action. This brake or arresting mechanism may be con- 7 structed, for instance, as shown in Figs. 1 and -3. G is a stationary coil within which is movable longitudinally, in a direction parallel to the axis of the pointer Z, a core G2 carrying a plate or bar G3 adapted to engage said pointer. A spring G4 tends to keep the plate or bar G3 out of contact with thezpointer Z, so as to allow the latter to move freely. This plate or-bar is indicated in Fig. l by a shaded rectangle. Whenever the coil G is energized, the core G: will be moved in the direction of the arrow in Fig. 3, against the action of the spring G4, and. thus the plate or bar G3 will be brought against the pointer Z with suflicient pressure to prevent such pointer from being carried along by the tester F during its rotation.

During the time required for tester F to move from contact a to the pointer Z relay R1 is ex- 10c cited and the short-circuit oi the high frequency supply or transmitter His by contact 4 is interrupted, so that during this time high frequency current flows to line L. At the receiving station, Figure 2, the high frequency receivenHj'E re 105 sponds to this current by exciting the relay R6 as long as the current flows. Relay R6 closes contact 11 and opens contacts 12 and 45.. Contact, 11 puts in circuit the magnetic clutch Kl, thereby coupiing crank arm c with shatt d which i is pivoted at o by the upwardly extending end of is constantly rotated in the direction of the arrow by motor M02. The end of arms in ;aslot ing-disc h and starts i'rom contact gwhich corresponds with contact a of the If it encounters the pointer 8 during its movement it carries-the pointer with it as far as it goes, thatistosaysolongasrelaylte is excited. The pointer S is double cranked so that its end may move over a scale on theffront oithe receiver casing. The distance vof-polntei' 8 from the point 1 corresponds with the distance of pointer 2 from point a; in other words the two pointers have the same position on their respective scalel.

Upon relay ltii de-energiaing K1 is taken out, and the circuit of clutch K2 completed at contact 12 overcontact 9 of relay Clutch K2 connects the arm 1', normallyheld by sprim m at the end i of slothl, with shaft twhich is driven in the opposite direction to shaft d. Arm

-risturnedfromitoq.meetingarmeonitsway and taking it along to a while the balanced 1 pointers remains where it is. As soon aaarmr reaches contact '0 the circuit of relay R5 is closed, the relay excites, completes at contact 10 a holding'circuitf-for itself over contact of relay R8, andvbre'aks at contact 9 the circuit of clutch K2 so freeing arm 1' to be returned by spring in to its position of rest 1. The apparatus is then ready for the next transmission, and until that occurs relayRS remains excited;-it is deenergized when relay R6, excited afresh over the line L. openscontacts 12 and 45,-; v I

It will sometimes occur that arm 0 .will come to a stand-still before it reaches pointer S, the preceding deflection having been greater. Means are then required to'return pointer S to the position at which arm e-stops. For this purpose the end of arm r is fittedwith a movable finger pwhichstrlkesalugronthepointer S andcarries it along to'arm, e. At the instant arm 1' touches-arm e the resistance of the latter puts the finger out of action, so that the pointer B is freed and stands still, while the twoIarms r andemoveontoa. Thismisshown upon an enlarged scale in Fig. 4, The finger p the arm 1' and is normally held, against the action of a spring a, in the position shown in Fig. 4,

byahook isecuredtothe bell-crank lever kfulcrumed at f on the arm 1', and normally held in looking engagement with the finger p by the action of a spring n. -When the said finger p engages the lug :aon the pointer S, the latter is carried along until the radial arm of bell-crank lever It strikes against'arm e. As arm r continues to move, the resistance of arm e sufiices to rock bell-crank lever in so that it will release the firiger'p. V Said finger then slips past lug z, and

the pointer S is left behind. on the other hand,

armeiscarried alongby theradialarmofbellcrank lever k. to the abutment q. When thereupon arm 1 returns clockwise, finger 9, being held in a slanting position by the springs, clears the lug z and passes by it without touching it,

so that the pointer-AS is not moved at this time. when the arm 1' strikes against abutment q, finger p is again pressed behind hook 1 and is thus ready once more to carry along the pointer 8 to the position of the arm e.

In this example of the invention the parts S, e, iare designed to'correspond with the parts Z,

F so that the deflection of pointer S is always exactly proportional to that of the pointer Z. The invention is not however limited to such coraxial; they are shown on different axes only for the sake of clearness.

' What I claim is:

l. A system for transmitting the indications of an instrument to a distance, comprising a transmitting measuring instrument, a transmis- 35 sion line and a receiving instrument, the transmitting instrument having a scale and a member positioning itself in correspondence with the magnitude to be measured, a contact arranged at a fixed point of said scale. a movable tester at said instrument, means for moving sad tester periodically over said contact and said member, said tester cooperating with said contact and said member to perform two-circuit-controlling operations, means for maintain ng a. current'fiow over said transmission line during the time inter val between the said two controlling operations of the tester, said receiving instrument having a member adapted to be moved so as to indicate the positional the said member of the trans- 109 mitting instrument, and means for starting said indicating member .of the receiving instrument by the first, and for stopping it by the second contact control at the transmitting instrument.

2. A system for transmitting the indications of an instrument to a distance, comprising. a transmitting measuring instrument, a transmission line and a receiving instrument, the transmitting instrument having a scale and a memcurrent flow over said tion line during the, time interval between the said two controlber positioning itself in correspondence with the 1m:

ling operations of the tester, said receiving instrument having a member adapted to be movedso as to indicate the position of the said member of the transmitting instrument, and means for starting said indicating member of the receiving instrument by the first, and for stoppin it by the second contact control at the transmitting instrument.

3. A system for transmitting the indications of an instrument to a distance, comprising a transmitting measuring instrument, a transmission line and a receiving instrument, the transmitting instrument having a scale and a member positioning itself in correspondence with the magnitude to be measured, a contact arranged at a fixed point of said scale, a movable tester at said instrument, means for moving said tester periodically over said contact and said member, said tester cooperating with said contact and said member to perform two circuit-controlling operations, two relays one of which is arranged 7140 to receive current upon engagement of said fixed contact by the tester, and to open at that time a 1 short-circuit associated with the transmit instrument and with the ton line, while the other of said relays is arranged to receive current upon engagement of said member by the tester and to render such first-mentioned relay inoperative, said receiving instrument having a member adapted to be moved so as .to indicate the position-of the said member of the trans- 4. A system for transmitting the indications of an instrument to a distance, comprising a transmitting measuring instrument, a transmission line and a receiving instrument, the transmitting instrument having a scale and a member positioning itself in correspondence with the magnitude to be measured, a contact arranged at a fixed point of said scale, a movable tester at said instrument, means for moving said tester periodically over said contact and said member, said tester cooperating with said contact and said member to perform two circuit-controlling operations, means for arresting said member when it is reached by the tester, means for maintaining a current flow over said transmission line during the time interval between the said two control-, ling operations of the tester, said receiving instrument having a member adapted to be moved so as to indicate the position of the said member of the transmitting instrument, and means for starting said indicating member or the receiving instrument by the first, and for stopping it by the second contact control at the transmitting instrument. a

5. In a telemetric system, a transmitter, a receiver and a circuit connecting said transmitter with said receiver, said transmitter comprising quantity responsive means, motor means continuously operable at substantially constant speed and means controlled jointly by said means to produce a signal in said circuit of a time duration corresponding to said quantity, and said receiver comprising substantially constant speed motor means and means actuated thereby for the duration of said signal.

6. In a telemetric system, a transmitter, a receiver and a circuit connecting said transmitter with said receiver, said transmitter comprising quantity responsive means, driving'means continuously operable at substantially constant speed and means cyclically operable under the control 01 said means to produce signals in said circuit of time durations corresponding to said quantity, and said receiver comprising means cyclically operable in approximate synchronism with said transmitter driving means for the duration of said signals. v

7. In a telemetric system, a transmitter, a receiver and a circuit connecting said transmitter with said receiver, said transmitter comprising quantity responsive means, driving means continuously operable at substantially constant speed and means cyclically operable under the control of said meansto produce signals in said circuit of time durations corresponding to said quantity, and said receiver comprising means cyclically operable in approximate synchronism with said transmitter driving means for the duration of said signals, and indicating means positionable by KURT WILDE.

said last named means. 

